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Top 130 C# Interview Questions
Entry Junior Mid Senior Expert
Theoretical Questions
Q1:
What are Property Accessors?
Entry
Q2:
What is the difference between continue and break statements in C#?
continue and break statements in C#? Entry
Q3:
What is C#?
Entry
Q4:
What is an Object?
Object? Entry
Q5:
What are partial classes?
Junior
Q6:
What is enum in C#?
Junior
Q7:
Can multiple catch blocks be executed?
Junior
Q8:
What is namespace in C#?
Junior
Q9:
How is Exception Handling implemented in C#?
Junior
Q10:
What is the difference between string and StringBuilder in C#?
string and StringBuilder in C#? Junior
Junior
Junior
Q13:
What is Serialization?
Junior
Q14:
What are dynamic type variables in C#?
Junior
Q15:
What are the different types of classes in C#?
Junior
Q16:
What is the difference between a Struct and a Class in C#?
Struct and a Class in C#? Junior
Q17:
In how many ways you can pass parameters to a method?
Junior
Q18:
Can this be used within a Static method?
this be used within a Static method? Junior
Q19:
Why to use finally block in C#?
finally block in C#? Junior
Q20:
What are Nullable types in C#?
Junior
Q21:
What is Managed or Unmanaged Code?
Junior
Junior
Q23:
Related To: .NET Core
What you understand by Value types and Reference types in .NET? Provide some comparison.
Related To: .NET Core Junior
Q24:
What are Reference Types in C#?
Junior
Q25:
What is an Abstract Class?
Junior
Q26:
What are generics in C#?
Junior
Q27:
When to use Record vs Class vs Struct in C#?
Mid Q28:
What is Record in C#?
Mid Q29:
What are the uses of using in C#
using in C# Mid Mid Mid Q32:
Related To: .NET Core
Is there a way to catch multiple exceptions at once and without code duplication?
Related To: .NET Core Mid Q33:
How encapsulation is implemented in C#?
Mid Q34:
Explain assignment vs shallow copy vs deep copy for a Record in C#
Mid Q35:
What is sealed Class in C#?
sealed Class in C#? Mid Mid Q37:
Explain Code Compilation in C#
Mid Q38:
What is Extension Method in C# and how to use them?
Mid Q39:
What is an anonymous function in C#?
Mid Q40:
What is difference between constant and readonly?
constant and readonly? Mid Q41:
What is Reflection in C#.Net?
Mid Q42:
What is scope of a Internal member variable of a C# class?
Mid Q43:
What is the difference between overloading and overriding?
Mid Q44:
What is a Destructor in C# and when shall I create one?
Mid Mid Q46:
Is there a difference between throw and throw ex?
throw and throw ex? Mid Q47:
What is the difference between ref and out keywords?
ref and out keywords? Mid Q48:
Explain Anonymous type in C#
Mid Q49:
Why can't you specify the accessibility modifier for methods inside the Interface?
Mid Q50:
What is the difference between dynamic type variables and object type variables?
Mid Mid Q52:
What is lambda expressions in C#?
Mid Q53:
What is the difference between Equality Operator (==) and Equals() Method in C#?
==) and Equals() Method in C#? Mid Q54:
What is the use of Null Coalescing Operator (??) in C#?
??) in C#? Mid Q55:
What is Virtual Method in C#?
Mid Q56:
What is difference between late binding and early binding in C#?
Senior Q57:
What is the difference between Func<string,string> and delegate?
Func<string,string> and delegate? Senior Q58:
Is operator overloading supported in C#?
Senior Q59:
Can Multiple Inheritance implemented in C# ?
Senior Q60:
What interface should your data structure implement to make the Where method work?
Where method work? Senior Senior Q62:
What is the use of conditional preprocessor directive in C#?
Senior Senior Senior Q65:
What happens when we Box or Unbox Nullable types?
Senior Q66:
Can you explain the difference between Interface, abstract class, sealed class, static class and partial class in C#?
Interface, abstract class, sealed class, static class and partial class in C#? Senior Senior Senior Q69:
When to use ArrayList over array[] in C#?
ArrayList over array[] in C#? Senior Q70:
IEnumerable vs List - What to Use? How do they work?
IEnumerable vs List - What to Use? How do they work? Senior Q71:
When would you use delegates in C#?
Senior Q72:
What are the different ways a method can be overloaded?
Senior Q73:
What is the best practice to have best performance using Lazy
Senior Q74:
What is scope of a Protected Internal member variable of a C# class?
Senior Q75:
What is Indexer in C#?
Senior Q76:
Explain what is Short-Circuit Evaluation in C#
Senior Q77:
Can you create a function in C# which can accept varying number of arguments?
Senior Q78:
What is Marshalling and why do we need it?
Senior Q79:
What is the difference between is and as operators in C#?
is and as operators in C#? Senior Q80:
What are pointer types in C#?
Senior Q81:
What is the yield keyword used for in C#?
yield keyword used for in C#? Senior Q82:
What's the difference between StackOverflowError and OutOfMemoryError?
StackOverflowError and OutOfMemoryError? Senior Q83:
Why to use lock statement in C#?
lock statement in C#? Senior Senior Q85:
What is the difference between dispose and finalize methods in C#?
dispose and finalize methods in C#? Senior Q86:
What is the Constructor Chaining in C#?
Senior Q87:
What is the difference between System.ApplicationException class and System.SystemException class?
System.ApplicationException class and System.SystemException class? Senior Expert Q89:
Could you explain the difference between destructor, dispose and finalize method?
destructor, dispose and finalize method? Expert Q90:
Explain the difference between IQueryable, ICollection, IList & IDictionary interfaces?
IQueryable, ICollection, IList & IDictionary interfaces? Expert Q91:
Can you add extension methods to an existing static class?
Expert Q92:
What is the difference between Lambdas and Delegates?
Expert Q93:
What is a preprocessor directives in C#?
Expert Q94:
in C#, when should we use abstract classes instead of interfaces with extension methods?
Expert Q95:
What is the method MemberwiseClone() doing?
MemberwiseClone() doing? Expert Q96:
Implement the Where method in C#. Explain.
Where method in C#. Explain. Expert Expert Q98:
What is the volatile keyword used for?
volatile keyword used for? Expert Q99:
What are Circular References in C#?
Expert Q100:
Could you explain the difference between Func vs. Action vs. Predicate?
Func vs. Action vs. Predicate? Expert Q101:
Related To: OOP
You have defined a destructor in a class that you have developed by using the C#, but the destructor never executed. Why?
Related To: OOP Expert Q102:
List some different ways for equality check in .NET
Expert Q103:
What is Multicast Delegate in C#?
Expert Q104:
What is the use of static constructors?
static constructors? Expert Q105:
What is jagged array in C# and when to prefer jagged arrays over multi-dimensional arrays?
Expert Q106:
What are the differences between IEnumerable and IQueryable?
IEnumerable and IQueryable? Expert Expert Q108:
Why Abstract class can not be sealed or static?
Expert Q109:
Explain what is Weak Reference in C#?
Expert Q110:
What's the difference between the System.Array.CopyTo() and System.Array.Clone()?
System.Array.CopyTo() and System.Array.Clone()? Expert Q111:
What is deep or shallow copy concept in C#?
Expert Code Challenges
Junior Junior Q3:
CSPY Related To: Binary Tree, Data Structures
Can you do Iterative Pre-order Traversal of a Binary Tree without Recursion?
CSPY Related To: Binary Tree, Data Structures Mid Q4:
Can you return multiple values from a function in C#? Provide some examples.
Mid Q5:
What is the output of the program below? Explain.
Mid Q6:
Given an array of ints, write a C# method to total all the values that are even numbers.
Mid Mid Q8:
Refactor the code
Mid Mid Q10:
CSJavaPY Related To: Strings, Data Structures, Java
How to check if two Strings (words) are Anagrams?
CSJavaPY Related To: Strings, Data Structures, Java Mid Q11:
Is the comparison of time and null in the if statement below valid or not? Why or why not?
Senior Q12:
What is the output of the program below?
Senior Q13:
CSJSJavaPY Related To: Fibonacci Series, Data Structures, JavaScript
Binet's formula: How to calculate Fibonacci numbers without Recursion or Iteration?
CSJSJavaPY Related To: Fibonacci Series, Data Structures, JavaScript Senior Senior Q15:
Is relying on && short-circuiting safe in .NET?
Senior Q16:
CSJSJavaPY Related To: Divide & Conquer, Fibonacci Series, Searching, Data Structures, JavaScript
Explain what is Fibonacci Search technique?
CSJSJavaPY Related To: Divide & Conquer, Fibonacci Series, Searching, Data Structures, JavaScript Senior Q17:
What is the output of the short program below? Explain your answer.
Senior Q18:
What is the output of the program below? Explain your answer.
Senior Q19:
Calculate the circumference of the circle
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